Fuse



March 11 1924.

1,486,170 G. R. TRUMBULL FUSE Filed May 17 1921 INV T 0/? 612212310203 BY 7 4770 N575.

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o blown.

Patented Mar. 11, 1924.

UNITED STATES PATENT OFFICE.

GEORGE R. TRUMBULL, OF BANTAM, CONNECTICUT, ASSIGNOR TO VOLK MFG. CO., INC., 015 BANTAM, CONNECTICUT, A. CORPORATION OF NEW JERSEY.

FUSE.

Application filed May 17,

To all whom it may concern:

Be it known that I, GEORGE R. TRUMBULL, a citizen of the United States of America, residing at Bantam, Litchfield County, Connecticut, have invented a new and useful Fuse, of which the following is a specification.

My invention relates to fuses, and con.- sists in, the novel combination and arrangement of parts hereinafter described. The object of the invention broadly speaking, is to provide a simple fuse construction which will permit of the ready insertion of a new fusible element after the fuse has been The fuse casing is also so constructed that when the fusible element is blown no fire will escape from said casing.

In the drawings,

Figure 1 is a view on a large scale which shows the fuse partly in side elevation and partly in longitudinal section.

Fig. 2 is an end elevation of the fuse.

l ig. 3 is a section on the line w-a; of Fig. 1 looking in the direction of the arrows.

Fig. f is a section of a modification.

Fig. 5 is a plan view of the fusible strip alone, the same being shown on a relatively reduced scale.

1!. represents a casing usually of tubular or cylindrical form, and formed of non-conducting i'iiiaterial. 2 is the fuse strip or fuse element proper which passes through the casing and is held at the ends thereof by the caps. The cap construction at each end of the tubular portion 1 may correspond, and hence, a description of the construction at one end will suffice Ir both. 3 is a cap which is rigidly secured to the end of the housing 1, as by means of any suitable mechanical fastenings, such as pins 4-4. in

the form shown in Fig. l, the outer end of this cap is relatively thick and is provided with a screw hole in its outer side which does not pass entirely through the cap. This cap is also provided with a passage 5 through which the end of the fuse strip 2 may e passed. If desired, it may also have additional holes 66 for venting purposes as hereinafter described. 7 is a removable cap which makes a snug sliding fit with the fixed cap 3. 8 is a screw by which the removable cap 7 is detachably secured to the fixed cap 3. In the preferred form, this screw is rigidly mounted in the center of the removable cap 7, and in said preferred construc- 1921. Serial No. 470,257.

tion, the said screw is provided with a flange ,9 which acts as a spacer for a baflle plate or equivalent device 10, which is interposed be tween the inner wall of the removable cap 7 and the outer wall of the fixed cap 3. This bafile plate 10 in its preferred form is of an exterior circumference slightly smaller than the interior circumference of the cap 7. The cap 7 at its outer end is provided with suitable vents 1l-11. WVhen the parts are assembled as shown in Fig. 1, that part of the fuse strip 2 which is bent over and rests on the outer side of the iixed cap 3, acts as a spacer for the baflie plate 10. Hence, when the fuse strip 2 is blown, the gases generated may pass out through the passage 5 or vents 6 in the head of the fixed cap 3, thence they are deflected by the baflie plate and pass around the edge of the same into the space between the baille plate and the inner wall of the removable cap 7 from which space said gases will escape through the vents 1l11. The several parts and the size of the Vents may be so proportioned that any suitable de groe of resistance may be interposed to the escape of gas, the aim being to permit the gases to escape with the necessary freedom and yet to check the flame. This construction lends itself to ready application to fuses of different sizes. \Vhen the fuse has been blown, the end cap 7 may be readily removed. If the screw 8 were permitted to project through the end of the fixed cap 3 and into the interior of the fuse chamber, the blowing of the fuse might deposit fusible material thereon which would resist the ready removal of said cap, hence, it is decidedly advantageous to guard against this. When both removable end caps have been removed, the parts of the blown fuse strip may also be removed and a new fuse strip inserted. In the preferred construction, 1 form in one side of one of the fixed caps 3 a recess to afford clearance for the tip end 2 of the fuse strip. The said tip end may be exposed, thereby making it possible to stamp on said tip a mark which will visibly indicate the capacity of said strip.

In the modification shown in Fig. 4, I have indicated the fixed cap 3 with the head of the same thickness as the sides, and in this case, I have indicated a disc 12 forced into place in the bottom of the cap, the center of said disc being recessed as at 12 to form a clearance space for the end of the fastening screw. This recessed disc functions to protect the end of the screw so that molten metal will not be deposited therein, and this modification is merely indicative of one of the many modifications that can be made.

What I claim is 1. In a fuse, a tube of insulating material, a cap fixed at each end thereof and having a passage therethrough for a fuse strip, a screw hole in the end of said cap, a removable cap, a vent in the end of said removable cap, a baffle plate between the outer end of the fixed cap and the inner end of the removable cap, a screw for holding the removable cap in place, and a fusible element within said tube and secured at its ends by said caps, said baffle plate being seated on said fusible element and spaced thereby from said fixed cap, and a spacer between said bafile plate and said removable cap.

2. In a fuse, a tube of insulating material, a cap fixed at the end thereof and having a passage for a fuse strip, a screw hole in the end of said cap, a removable cap having vent therein, a battle between the outer end of the fixed cap and the inner end of the removable cap and spaced apart from said caps, a screw for connecting the removable cap to said fixed cap, said screw being carried by the removable cap, and a fuse strip having one end passed through said fixed cap and bent over to space the baflie plate from said cap whereby said screw will hold all of said parts in proper spaced relation.

3. In a fuse, a tube of insulating material, a fusibl element located therein and means at each end of the tube for engaging the ends of the fusible element, one of said means comprising, a cap fixed on the end of the tube through which one end of the fusible element passes, a removable cap overstanding the fixed cap, a screw for con necting said caps, a separate disc-like baffle plate through which said screw passes and arranged between the ends of the two caps. said caps having vent passages on opposite sides of said bafiie plate.

a. In a fuse, a tube of insulating material, a fusible strip extending longitudinally thercthrough, means at both ends of said tube to which said fusible element is detachably secured at its ends, one of said means comprising a cap fixed at the end of said tube through which cap said fuse passes whereby the end of said fuse may be bent fiatwise against the end of the cap, a second cap removably mounted on the fixed cap, vents in the ends of both of said caps to permit the escape of gases, at baffle plate interposed between the vents in said two caps, said baffle plate being arranged to rest upon the bent over end of the fuse strip and to be spaced thereby from the fixed cap, a spacer between the removable cap and said baffle plate, said strip and spacer forming a tortuous passage to permit the escape of gases generated within the tube upon the blowing of the fuse, and a screw fastening for securing said several parts together.

5. In a fuse, a tube of insulating material, a cap fixed at the end thereof and having a passage for a fuse strip, a removable ca havin a vent therein, a separate ba e plate between the outer end of the fixed cap and the inner end of the removable cap and spaced apart from said caps, a screw thread connection between aid removable cap and said fixed cap, and a fuse strip held in place by and between said caps.

6. In a fuse, a tube of insulating material. a fusible strip extending longitudinally therethrough, means at both ends of said tube to which said fusible element is detachably secured atits ends, one of said means comprising a cap fixed at the end of said tube through which cap said fuse passes whereby the end of said fuse may be bent fiatwise against the end of the cap, a second cap removably mounted on the fixed cap, vents in the ends of both of said caps to permit the escape of gases, a separate baffle plate interposed between the vents in said two caps, said battle being arranged to rest upon the-bent over end of the fuse strip and to be spaced thereby from the fixed cap, a spacer between the removable cap and said bafiie, said strip and spacer holding said bathe in position to form a tortuous passa e to permit the escape of gases generated within the tube upon the blowing of the fuse, and a screw fastening for securing said caps together, and means for protecting the inner end of the screw from the deposit of metal thereon due to the blowing of the fuse.

7. In a fuse casing, a tube of insulating material, a cap fixed at the end thereof and having a passage for the end of a fuse strip, a removable cap having a vent therein and overstanding said fixed cap and fuse end, a baffie between the ends of said fixed and removable caps and spaced apart therefrom, a screw for connecting the ends of said caps, said screw passing through said bafiie and into the end of the fixed cap, and a guard to protect the inner end of said screw from contact with molten metal when the fuse is blown.

GEORGE R. TRUMBULL. 

